WA Computer Science ATAR Unit 1 Word Scramble: Standard Algorithms and Network Communications (Modules 315–470)
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Word scramble
Unscramble the letters and write each key term on the line.
1
2(O^N)
Bubble and selection sort both make about n squared comparisons, so doubling n quadruples the work, but selection sort makes far fewer swaps.
2
TNMIAIOOCNMUC OMEDL
How devices share the work of requesting and providing data: client-server uses dedicated servers, while peer-to-peer lets every device do both.
3
RONKTEW AERLY ELMDO
Splits network communication into layers that each do one job and talk only to the layers above and below, so vendors interoperate, layers change alone and faults are easier to find.
4
SOI LOMDE
A seven-layer network model: physical, data link, network, transport, session, presentation, application. Layer 1 is physical (bottom) and layer 7 is application (top).
5
PIP/TC OT SIO NGIPMAP
Each TCP/IP layer covers one or more OSI layers: Application = OSI application, presentation and session; Network Access = physical and data link; Transport and Internet match one each.
6
OUTPAESAICLNN
Each layer on the sender adds its own header (and sometimes a trailer) as data moves down the layers. The receiver removes them in reverse order, which is called decapsulation.
7
EEVCID RLYAE
The OSI layer a device works at: hubs at layer 1, NICs and access points at layers 1-2, switches at 2, routers at 3, and firewalls and proxies at layers 3 to 7.
8
OOTLPOGY
The layout of a network: bus shares one cable, ring passes data around a loop, and mesh links devices by many paths.
9
KWOTREN NGISED CAOFTSR
The needs and limits, such as cost, performance, reliability, security, scalability and user needs, that decide which devices, cables and layout a network should use.
10
LIIYSATBCAL
A scalable network can grow in users, devices and traffic without a major redesign, for example by planning for growth, keeping spare switch ports and having an upgrade path.
11
WTKONER ISDGNE
Turning user requirements into a plan by choosing devices, media, topology, IP addressing and security controls, then justifying each choice.
12
EIFL ATPH
The location of a file in the folder tree, written from the root (absolute, e.g. /home/sam/file.txt) or from the current folder (relative).
13
NCRO
A scheduler that runs a command or script at set times without a person starting it, such as a nightly backup. Windows Task Scheduler does the same job.
14
HLLSE RTIPSC
A text file of shell commands, such as cp, mv or rm, that run in order each time the script is run, so file tasks like backups can be automated.
15
YSISOC.PLUC(HRT, STD)
Python call that copies a file to a backup folder. Put a datetime timestamp in the new name so old backups are not overwritten, and a scheduler can then run the script.
Answer Key
WA Computer Science ATAR Unit 1 · Modules 315–470
12(O^N) → O(n^2) — Bubble and selection sort both make about n squared comparisons, so doubling n quadruples the work, but selection sort makes far fewer swaps.
2TNMIAIOOCNMUC OMEDL → communication model — How devices share the work of requesting and providing data: client-server uses dedicated servers, while peer-to-peer lets every device do both.
3RONKTEW AERLY ELMDO → network layer model — Splits network communication into layers that each do one job and talk only to the layers above and below, so vendors interoperate, layers change alone and faults are easier to find.
4SOI LOMDE → OSI model — A seven-layer network model: physical, data link, network, transport, session, presentation, application. Layer 1 is physical (bottom) and layer 7 is application (top).
5PIP/TC OT SIO NGIPMAP → TCP/IP to OSI mapping — Each TCP/IP layer covers one or more OSI layers: Application = OSI application, presentation and session; Network Access = physical and data link; Transport and Internet match one each.
6OUTPAESAICLNN → encapsulation — Each layer on the sender adds its own header (and sometimes a trailer) as data moves down the layers. The receiver removes them in reverse order, which is called decapsulation.
7EEVCID RLYAE → device layer — The OSI layer a device works at: hubs at layer 1, NICs and access points at layers 1-2, switches at 2, routers at 3, and firewalls and proxies at layers 3 to 7.
8OOTLPOGY → topology — The layout of a network: bus shares one cable, ring passes data around a loop, and mesh links devices by many paths.
9KWOTREN NGISED CAOFTSR → network design factors — The needs and limits, such as cost, performance, reliability, security, scalability and user needs, that decide which devices, cables and layout a network should use.
10LIIYSATBCAL → scalability — A scalable network can grow in users, devices and traffic without a major redesign, for example by planning for growth, keeping spare switch ports and having an upgrade path.
11WTKONER ISDGNE → network design — Turning user requirements into a plan by choosing devices, media, topology, IP addressing and security controls, then justifying each choice.
12EIFL ATPH → file path — The location of a file in the folder tree, written from the root (absolute, e.g. /home/sam/file.txt) or from the current folder (relative).
13NCRO → cron — A scheduler that runs a command or script at set times without a person starting it, such as a nightly backup. Windows Task Scheduler does the same job.
14HLLSE RTIPSC → shell script — A text file of shell commands, such as cp, mv or rm, that run in order each time the script is run, so file tasks like backups can be automated.
15YSISOC.PLUC(HRT, STD) → shutil.copy(src, dst) — Python call that copies a file to a backup folder. Put a datetime timestamp in the new name so old backups are not overwritten, and a scheduler can then run the script.